Improvement in balanced valves



UNITED STATES PATENT OFFICE WILLIAM STEPHENS, OF PITTSTON, PENNSYLVANIA.

IMPROVEMENT IN BALANCED VALVES.

Specification forming part of Letters Patent No. 189,512, dated April 10, 1877 application tiled February 13, 1877.

To all whom it may concern:

Be it known that I, WILLIAM STEPHENS, of Pittston, in the county ofLuzerne and State of Pennsylvania, have invented certain new and useful Improvements in Slide-Valves for Steam-Engines; and I do hereby declare that the following' is a full, clear, and exact description thereof', reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part ot' this specification.

The nature of my invention consists ill the construction and arrangement of aslide-valve for steam-engines, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawing, in which- Figure 1 is a longitudinal vertical section ot' the steamechest with slide-valve. Fig. 2 is a plan view ot' the valve. Fig. 3 is a crosssection of the chest and valve.

A represents the steam-chest attached to the cylinder-face B, in which are the usual steam-ports c aand exhaust-port b. G is the slide-valve, above which is a loose back, D, provided with lugs or projections d d, resting upon shouldered supports E E, for the purpose of taking the load oli' the valve, allowing` the valve to work free between the faces B and D, and still remain steam-tight. The valve U is formedl with a central opening, C', and the loose back D forms the top of the valve. The supports E are cast on the face ot' the cylinder inside of the steam-chest, and the shoulders e e on top of the supports prevent the plate D from moving horizontally with the valve.

'Ihe back or top of the valve C is larger than the face, it having projections .1: along its sides at the top, as shown in Fig. 3, for the purpose of allowing the steam to act on said enlarged surface, to assist in supporting the weight ot' the valve.

On the top of the loose back or plate D are D" sul-table lugs or ears, between whlch are pivoted two bolts, G G, that extend up through the cover of' the steam-chest, and have nuts h h screwed upon their upper ends, for the purpose of regulating the plate upon the valve when the steam is on. The nutshhare made beveled or convex, and ground to lit the cavities or seats y y in the steam-chest cover, for the purpose ot' making it steam-tight, and regulating the pressure ofthe plate upon the valve when the steam is on.

It will be noticed that while the nuts h h prevent the plate D from going down beyond the point to which it has been adjusted, they form no impediment for the plate and valve being raised when required.

In the under face ot' the plate D are recesses it', of the same size as the steam-ports a a, for the purpose ot' equalizing the pressure ou the valve when steam enters the cylinder.

The valve C rests on a raised seat, m, and the plate D is the same length as said raised seat, in the same direction as the travel of the valve, so that the steam may act on both sides of' the valve when the valve travels beyoud the raised face.

I is the inlet for the steam to the steamchest.

Haviug thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The combination, in a slide-valve for steamengines, of the raised seat m and shouldered supports E within the valve chest, the valve C, having enlarged back projections a', the plate D, provided with recesses fi and lugs d, and the bolts G, with nuts h, all constructed and arranged to operate substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing as my own I at'tlx my signature in presence ot' two witnesses.

WILLIAM STEPH ENS. Witnesses J AMEs HELM, J onN MERRITT. 

